When Color Becomes a Casualty: How the Iran War Turned Japan's Snack Aisles Black and White

On May 12, 2026, Calbee — Japan's largest snack food company — announced it would strip the color from packaging on 14 of its best-known products, including its flagship potato chips, Kappa Ebisen shrimp crackers, and Frugra breakfast cereal [1]. Starting May 25, these products will appear on store shelves in stark black-and-white wrappers, a visual shorthand for an economic shock that has traveled thousands of miles from the Persian Gulf to Japanese convenience stores in under three months.

The cause is not an aesthetic choice. It is a naphtha shortage — the downstream consequence of the most significant oil supply disruption since the 1970s, triggered by the Iran war and the prolonged closure of the Strait of Hormuz [2].

The Chokepoint: How the Strait of Hormuz Broke the Ink Supply Chain

On February 28, 2026, the United States and Israel launched coordinated airstrikes on Iran under Operation Epic Fury, targeting military and nuclear facilities [3]. Iran retaliated with missile and drone strikes on Israel, U.S. military bases, and allied Gulf states. On March 4, Iran declared the Strait of Hormuz — through which roughly 25% of the world's seaborne oil trade and 20% of global LNG shipments normally pass — "closed," threatening to attack any vessel attempting transit [3].

The International Energy Agency called the resulting disruption "the largest oil supply disruption in the history" of the global market [3]. Maersk, MSC, CMA CGM, and Hapag-Lloyd all suspended transits. Over 150 tankers anchored outside the strait rather than risk attack [4]. A brief reopening attempt on April 21–22 collapsed within 24 hours [3]. As of mid-May 2026, the strait has been effectively closed to commercial shipping for more than 69 days.

The impact radiated far beyond crude oil. Naphtha — a liquid hydrocarbon mixture derived from petroleum refining — is the feedstock for an enormous range of industrial chemicals. Heated to over 800°C, it decomposes into base chemicals used to produce plastics, synthetic fibers, rubber, paints, adhesives, and printing inks [5]. Naphtha is used as both a solvent and a resin component in printing inks, making it indispensable for the flexible plastic packaging that wraps virtually every processed food product sold in Japan and beyond.

Japan's Naphtha Dependency

Japan's exposure to this disruption is acute. According to the Japan Petrochemical Industry Association, Japan imports more than 60% of the naphtha it consumes, and 70% of those imports come from the Middle East [6]. In terms of total consumption, roughly 42% of Japan's naphtha was sourced from the Middle East before the war, 40% was produced domestically, and 18% came from other regions [6].

Source: Japan Petrochemical Industry Association

Data as of May 12, 2026CSV

Japan holds approximately 250 days of crude oil reserves but only about 20 days of naphtha stockpile [5]. That asymmetry reflects a longstanding assumption that naphtha, as a refined product, could always be sourced on spot markets — an assumption the Hormuz closure has shattered.

The Price Spike: From $580 to $1,030 in Four Weeks

The price trajectory of naphtha tells the story of the disruption's speed and severity. In Asia, C&F Japan physical naphtha sat around $580–$610 per metric ton in January and early February 2026 [7]. By the first week of March, it had jumped to $756/mt [7]. By March 15, S&P Global assessed it at approximately $875/mt [8]. On March 25, Singapore spot prices crossed the four-digit mark, with Northeast Asian benchmarks assessed between $1,010 and $1,050/mt — a roughly 75% increase in under a month [7].

Source: S&P Global / Alkagesta

Data as of May 12, 2026CSV

As of early May, prices have moderated slightly to around $950/mt but remain far above pre-war levels [7]. Analysts expect elevated prices to persist through at least Q3 2026, as any diplomatic resolution would take months to translate into reopened shipping lanes and repaired logistics infrastructure [7].

The year-over-year increase has been roughly 60%, according to Nikkei Asia [6]. This is not merely a cost inconvenience. For companies whose margins depend on packaging inputs priced in single-digit-percentage ranges, a 60% spike in a key feedstock is existential.

Beyond Calbee: The Scale of the Packaging Crisis

Calbee is the most prominent company to publicly announce packaging changes, but it is far from alone. Corporate research firm Teikoku Databank surveyed Japanese food and beverage companies and found that 77% use naphtha-derived materials in their containers or packaging [9]. One in four companies said they would struggle to maintain normal business operations if the shortage continues [9].

A survey released in late April by a Japanese industry and consumer group association found that more than 70% of roughly 100 responding companies said they would likely raise prices if naphtha supply concerns persist [6]. Major snack and food companies including Meiji, Ezaki Glico (maker of Pocky), and Yamazaki Baking all rely heavily on flexible plastic packaging, making them similarly vulnerable [10].

The Japan food sector is also contending with broader container shortages. Nikkei Asia reported that the naphtha disruption is affecting not just ink but the production of plastic food containers themselves, compounding the packaging crisis [10].

Globally, flexible plastic packaging is equally essential. PepsiCo, Mondelez, Mars, Nestlé, and Kellanova all depend on the same petrochemical-derived packaging materials [10]. While these multinational companies have more diversified supply chains than Japanese domestic producers, they are not immune — the Hormuz closure affects feedstock availability worldwide, not just for Japan-bound shipments.

Ink Manufacturers Respond: Price Hikes Across the Board

The world's largest printing ink manufacturers have moved quickly to pass through costs. Sun Chemical, the largest global ink producer, announced on March 19 that it would implement price increases and surcharges across all product divisions, citing geopolitical developments in the Middle East that are "significantly impacting global energy markets, logistics routes, and chemical feedstock availability" [11].

On April 15, artience (parent company of Toyo Ink Group) announced price increases across its full product line — gravure and flexographic inks, energy-curable inks, offset inks, and screen inks [11]. These are not selective adjustments; they are blanket increases affecting every ink category.

The affected ink types span the full range of packaging applications. Gravure and flexographic inks — the dominant technologies for flexible food packaging — are most directly hit because they rely heavily on petroleum-derived solvents and resins [11]. Offset inks, used primarily for carton and label printing, face similar feedstock pressure. Even UV/LED-curable inks, which use less solvent, depend on petrochemical-derived photoinitiators and oligomers.

The global ink market was valued at approximately $23.8 billion in 2025, with major players including Sun Chemical, DIC Corporation, Flint Group, Siegwerk, and Toyo Ink [11]. While these companies are raising prices in response to cost pressures, the price increases also create conditions for margin improvement — a dynamic that procurement executives watch closely.

The Sulfur Connection: Titanium Dioxide Under Pressure

The naphtha shortage is only one vector through which the Hormuz closure is disrupting pigment supply chains. Sulfur, another critical industrial chemical, has been severely affected. Gulf states account for roughly 45% of global sulfur supply, and the near-total halt of tanker traffic through the strait has sent U.S. sulfur prices up more than 150% year-over-year to approximately $500 per metric ton [12].

This matters for printing inks because titanium dioxide (TiO₂) — the most widely used white pigment in inks, coatings, and plastics — is predominantly manufactured through the sulfate process, which requires 4.0 to 4.5 metric tons of concentrated sulfuric acid per ton of ilmenite concentrate [12]. China produces more than 60% of the world's TiO₂, and approximately 80% of Chinese output uses the sulfate route [12]. The sulfur crisis therefore imposes a direct cost shock on roughly half of global TiO₂ capacity.

The Steelman Case: Is the Shortage Overstated?

Not everyone is convinced the physical supply situation justifies the degree of disruption visible in consumer markets. Several structural factors suggest the crisis may be amplified by market behavior beyond genuine scarcity.

First, the speed of the downstream impact is notable. Calbee announced monochrome packaging just 10 weeks after the Hormuz closure — a lag that is short by historical comparison. During the COVID-19 pandemic, packaging material shortages took roughly 4–6 months to manifest at the retail level; after the 2011 Tōhoku earthquake and tsunami, supply chain disruptions to packaging took similarly long to propagate [10]. The rapid transmission of this shortage to consumer-facing products suggests that inventory buffers were already thin before the conflict, possibly indicating structural underinvestment in safety stock rather than an unprecedented physical shortage.

Second, the Dow Chemical CEO warned in late March that petrochemical shortages from the Iran war could "fuel inflation for the rest of the year" [13] — a statement that, while reflecting real cost pressure, also sets expectations for sustained price increases. When major producers publicly forecast persistent shortages, downstream buyers tend to accelerate purchasing, creating self-reinforcing scarcity dynamics.

Third, Japan's Prime Minister Sanae Takaichi stated on April 5 that Japan had secured enough naphtha supplies to cover at least four months of demand, including two months of procured imports and domestic refining output, plus two months of intermediate chemical product inventories [14]. By May 1, the government said it had secured supplies extending beyond year-end [15]. If the government's assessment is accurate, the acute shortage affecting ink production may reflect distribution bottlenecks and contract renegotiation dynamics rather than an absolute deficit of physical material.

That said, skeptics of the shortage narrative face a strong counterargument: the Strait of Hormuz has now been closed for over two months with no clear timeline for reopening, and Japan's 20-day naphtha reserve was never designed to absorb a disruption of this magnitude [5]. The four-month government figure includes downstream inventories and alternative procurement that may not fully substitute for the quality and volume of Middle Eastern naphtha that Japanese petrochemical crackers are optimized to process.

Consumer and Brand Impact

Calbee's monochrome packaging went viral on social media, with reactions ranging from disbelief to admiration. Some consumers interpreted the stripped-down design as a clever marketing move or appreciated the minimalist aesthetic; others raised concerns about the loss of visual product differentiation — Calbee's colorful bags are iconic in Japanese retail [16].

Research on packaging color and consumer behavior suggests the stakes are real. Color influences up to 85% of purchasing decisions, and product packaging serves as a primary tool for brand recognition at the point of sale [17]. When consumers are scanning supermarket shelves, color is processed faster than text. Monochrome packaging could force shoppers to rely on reading product names rather than recognizing familiar color cues — a slower, more effortful process that may reduce impulse purchasing.

However, there is a counterargument from the packaging design world: minimalist and monochrome designs can connote premium quality and sophistication [17]. Whether that association holds for a bag of potato chips in a Japanese konbini is an open question with no direct precedent at this scale.

For Calbee, the strategic calculus appears to favor monochrome packaging over price increases. By reducing ink usage, the company can absorb some of the feedstock cost increase without raising consumer prices — at a time when Japanese consumers are already contending with broader inflation driven by energy costs [6].

Government Response and Strategic Vulnerability

Japan's policy response has been substantial but has also exposed a structural blind spot. The government has expanded naphtha procurement from non-Middle Eastern sources, including the United States, Algeria, and Peru [15]. It has begun using crude oil reserves for domestic refining and drawing on downstream inventories of intermediate chemical products [14]. A task force established in early April monitors supplies of naphtha, petrochemical products, fuel oil, and goods tied to healthcare, logistics, and agriculture [15].

Yet the episode has revealed that Japan's strategic reserves — designed around crude oil — did not adequately account for the vulnerability of refined and intermediate products like naphtha. The 250-day crude oil reserve offers little immediate help when the bottleneck is in a specific refined product that requires specialized processing infrastructure [5].

Elsewhere, the disruption has prompted broader questions about industrial chemical supply chain resilience. The ISM (Institute for Supply Management) reported in March that the Middle East conflict was disrupting materials and logistics across multiple sectors [18]. The Z2Data supply chain intelligence firm documented ripple effects across global supply chains extending well beyond energy markets [19].

What Comes Next

The naphtha-to-ink supply chain has exposed an uncomfortable truth: consumer economies built on cheap, abundant petrochemicals are vulnerable to disruptions in ways that are difficult to hedge against. Japan's packaging crisis is the most visible manifestation, but the underlying problem — concentrated dependence on a single maritime chokepoint for critical industrial feedstocks — affects every country that relies on Middle Eastern petroleum derivatives.

If the Strait of Hormuz reopens in the coming months, the immediate crisis will ease, though analysts at Tufts University's Fletcher School have argued that even reopening will not restore the pre-war status quo for trade flows [20]. If the closure persists, Japan and other affected economies will face increasingly difficult choices between maintaining product quality, absorbing costs, or passing them to consumers.

For now, the black-and-white chip bags appearing on Japanese shelves serve as an unusually literal illustration of how far-reaching the consequences of geopolitical conflict can be — right down to the colors on a bag of potato chips.